Bolt connection for grinding-plates.



Patented nec. I7, 19m. MOHM.

MMU'FGUNNNECTION FUR 'GRUNDING PLATES.

w/rNEssEs: v

NITED Sterns artnr trickm DANIEL E. MORAN, OF NEY YORK, N. Y.

BOLT CONNECTION FOR GRIND|NGPLATES.

SPECIFICATION forming part of Letters Patent No. 689,109, dated December 1'7, 1901'. Application tiled April 5, 1901. Serial No. 54,416. (No model.)

.To @ZZ whom, t may concern:

Be it known that I, DANIEL E. Moi-mn, a citizen of the United States, residing in New York, borough of Manhattan, in the State of New York, have invented certain new and useful Improvements in Bolt Connections for GrindingPlates, of which the following is a specification.

The bolt connections heretofore in common use in ball-grinding mills were composed of bolts having wedge shaped shanks which were set in wedge-shaped openings in the grinding-plates and held in position by nuts screwed on the outer threaded ends of said bolts. This bolt connection was not satisfactory for the reason that the constant jar of the grindin g-bal1s upon the grinding-plates and inner ends of the bolts caused the loosening of the nuts and the breaking of the bolts.

The object of my invention is to furnish an improved bolt connection for the plates of grinding-mills in which the defects of the connection referred to are overcome and a more reliable and effective bolt connection obtained; and the invention consists of a bolt connection for the plates of grinding-mills which comprises a wedge-shaped bolt, wedgeshaped keys interposed in the opening of the grinding plate between the same and the wedge-shaped shank of the bolt, and a nut screwed on the outer threaded end of the bolt, as will be fully described hereinafter, and finally pointed out in the claims.

In the accompanying drawings, Figure lv represents a vertical longitudinal section of my improved bolt connection for the plates of grinding-mills. Fig. 2 is a plan view of the same. Fig. 3 is a vertical section on line 3 8, Fig. l. Fig. 4 is a vertical transverse section of a modified construction of bolt connection. Fig. 5 is a plan view of Fig. 4; and Fig. 6 is a vertical section on line 6 6, Fig. 4.

Referring to Figs. l, 2, and 3 of the drawings, ct indicates a grinding-plate, and b is the casing in which the grinding-plate a is supported. c is a bolt that is provided with a tapering shank c' and threaded end cz, and d is a nut screwed on the threaded end c2. ee are angular keys that are provided with wedge-shaped shanks e', seated in the correspondingly-formed tapering opening in the plate a, said keys passing through a registering opening of the shell Z7 and abutting at their outer ends by angular projections e2 against the shell ct. The Shanks of the keys are preferably of rectangular cross-section and are firmly held in position by the nut that is screwed upon the end of the bolt. In place of being rectangular in shape the keys and seats may be made semicircular or conical in shape, as shown in Figs. et, 5, and G. In these figures, ct is the grinding-plate; D', the casing; c3, the bolt; c, the shank of tho same; c5, its threaded end, and d' the nut screwed on the same. c3 are the angular keys; e4, the Shanks of the same, and e5 their projections, The semicircular shape of the keys and seats is useful in cases Where larger interlocking area and stronger bolt connection are desired.

My improved bolt connection has the advantage that the effect of the jarring action of the grinding-balls is considerably reduced, so that the breaking of the bolts by the jar and strain exerted on the same during the operation of the mill is prevented and a very reliable and strain-resisting bolt connection of the grinding-plates with the shell is obtained.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A bolt connection for the plates of grinding mills, consisting of a bolt having a wedge-shaped shank and a threaded outer end, keys inserted at both sides of the wedgeshaped bolt into openings of the grindingplate and shell of the mill, and a nut screwed on the outer threaded end of the bolt and abutting against the outer ends of the keys, substantially as set forth.

2. A bolt connection for the plates of grinding-mills, consisting of a bolt provided with a wedge-shaped shank, wedge-shaped keys between Said shank and tho corresponding walls of the grinding-plate and shell, and a nut screwed upon the threaded outer endl of the bolt and bearing on the outer ends of the keys, substantially as set forth.

3. The combination with a grinding-plate and the shell of a ball-grinding lnill, said plates being provided with a tapering opening, and the shell with a registering opening, of a bolt passing through said openings and IOO havinga wedge-shaped shank and a threaded In testimony7 that I claim the foregoing as outer end, keys passing through said perfomy invention I have signed my name in pres- Io rations at both sides of the bolt, said keys ence of two subscribing witnesses.

having wedge-shaped Shanks and lateral pro- 5 jectionsat their outer ends abutting against DANIEL E' MORAN' said shell, and a nul on said bolt and bearing Vitnesses: on the outer ends of said keys, substantially GEORGE GEIBEL,

as set forth. JOSEPH I-I. NILES. 

